SUPER-ORDER V MALACOSTRACA 665 
Sub-Order B. BRACHYURA. Latreille. (Crabs.) 
Abdomen short and reduced, without caudal fin, and curved around against the exca- 
vated ventral surface of the cephalothorax ; in the male narrow and pointed, with one to 
two pairs of abdominal feet ; in the female broad, with four pairs. Carapace frequently 
broader than long, usually depressed ; antennae short; third pair of mazxillipeds com- 
pletely covering the mouth parts. 
(1) The Dromiacea (Notopoda) have the carapace sub-triangular, sub-quadrate, 
or sub-orbicular, and the fifth pair of feet, which are sometimes 
chelate, are carried dorsally. Prosopon, v. Meyer (Fig. 1394), 
C D 

Fic. 1394. 
: Ae ele Fic. 1395. 
A, Prosopon marginatum, v. Meyer. Upper Jura (ce); Oerlinger Valley, 
near Ulm. %/9. 6B, P. personatum. Upper Jura (y); Weissingen, Wiirtem- Dromiopsis rugosa, Schloth. 
berg. Rostrum enlarged. OC, P. aculeatwm, v. Meyer. Same locality as A sp. Uppermost Cretaceous ; 
and D. D, P. pustulatwm, Quenst. 4 { Faxoe, Denmark. 
appears in the Lower Oolite, is abundant in the Upper Jura, and persists into the 
Neocomian. Similar, but somewhat larger forms with broader carapace occur in the 
A 

Fic. 1396. 
A, B, Ranina Marestiona, Konig (=R. Helli, Schafh.). Eocene; Kressenberg, Bavaria. Ventral and dorsal 
views. C, Chela of R. Bowilleana, M.-Edw. Eocene; Biarritz, France. 1/o. 
Upper Cretaceous. Such are Dromiopsis, Reuss (Fig. 1395); Binkhorstia, Noetling ; 
and Polycnediwm, Reuss. 
(2) The Raninoidea have the carapace somewhat elongate, broadest and truncate in 
front, chelae strongly compressed, and the other feet flattened and natatory. Raniella 
and Raninoides, Milne-Edw., occur in the Upper Cretaceous. Ranina, Lam. (Fig. 
1396), ranges from Eocene to Recent. 
(8) The Oxystomata have a rounded cephalothorax with the frontal region not 
projecting. The external maxillipeds together have a triangular outline, their apices 
